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[IEEE 2018 International Flexible Electronics Technology Conference (IFETC) - Ottawa, ON, Canada (2018.8.7-2018.8.9)] 2018 International Flexible Electronics Technology Conference (IFETC) - Smart Fibers Based on Low Dimensional Conductive Materials
摘要： The fragility of traditional metallic or semi-conductive materials hinders their application in flexible electronics. Low dimensional materials including carbon nanotubes, graphene and metal nanowires own outstanding flexibility and have been wildly used to fabricate flexible devices. Bendable/stretchable substrate is another key component of flexible electronics. Various thin polymer films made of polyethylene terephthalate, polyimide, polydimethylsiloxane et. al. were adopted. However, the air impermeability of these substrates will cause discomfort of humanbeing if applied in wearable electronics. Fiber is an ideal substrate for flexible and wearable electronics due to its excellent flexibility/stretchability, superior breathability, abundant microstructure and low cost. Herein, a series of conductive elastomers and strain sensors were fabricated by combining the low dimensional conductive materials with fiber substrates and regulating the microstructure on the interface. With the help of 'twining spring' hierarchical architecture, silver nanowire-double covered yarn (Ag NW-DCY) composite fibers with ultrahigh stretchability were obtained. The conductivity of the composite fibers reached up to 104 S/cm and remained 90% at 2000% tensile strain. Commercial electronic components (LED arrays) were integrated onto a transparent, foldable and stretchable substrate using the composite fibers as stretchable electric wiring, demonstrating the potential application in large-area stretchable electronics. When AgNWs were replaced with graphene, strain sensing fiber with high sensitivity and large working range (100% strain) were fabricated, which enabled the detection of multiple deformation forms, including tensile strain, bending, and torsion. We employ the fibers as wearable sensors, realizing the monitoring of full-range human activities and intricate movement combinations of a robot. Besides, these fibers exhibits fast response, low hysteresis and excellent cycling stability. Another advantage needs to be noted is that these fiber are fabricated by a facial dip coating method, which can be scaled up easily. These smart fibers are of great meaning to the development of flexible and wearable electronics.
关键词： smart textiles,stretchable conductive fibers,wearable electronics
更新于2025-09-23 15:22:29
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A polarization-resolved study of nanopatterned photoconductive antenna for enhanced Terahertz emission
摘要： Terahertz (THz) frequencies, despite having the potential for several important applications, have been relatively under-explored in the past owing to the unavailability of proper sources and detectors. The scenario has been changing over the last few decades due to the advent of convenient THz sources and detectors. THz photo-conductive antennas (PCA), due to their attractive features, such as cost-effectiveness, room temperature operation, is playing a key role in current and future research prospect in the field of THz spectroscopy, both as source and detectors. Complex PCA designs have been proposed and studied to boost the THz emission efficiencies. Elucidating the underlying physics in such devices requires a thorough investigation of a few physical parameters. This requires the integration of several experimental techniques under identical conditions. In this article, we show such a study, including a parametric variation of pump polarization, conducted on a PCA with nanopatterned active region which boosts the emitted THz radiation. Through the set of measurements, we unravel the subtle interplay of the various physical processes responsible for the emission of THz radiation from the device.
关键词： characterization setup,enhanced THz generation,Photo-conductive antenna,nano-pattern
更新于2025-09-23 15:22:29
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Tailorable and Flexible Conducting Films via Interfacial Modification of Polymer Fibers
摘要： Portable devices have become lightweight, flexible, and even stretchable such that skin-like electronics are widely applicable, including in biomedical devices, soft robotics, and human/machine interfaces. Rendering these devices soft and flexible is highly desirable, as this would enable them to interact seamlessly with human skin and improve their wearing comfort. We demonstrate a convenient but effective method to fabricate flexible conducting films. These films consist of electrospun polyurethane (PU) fibers as the flexible substrate onto which copper was deposited. These Cu-PU films have excellent conductivity, and their resistance only increases slightly after extensive folding, even when folded into a paper crane with a resistance of 1.8 Ω. Furthermore, Cu-PU films can sense tension strength and exhibit stable Joule electrothermal performance. The Cu-PU-based heating glove could be heated to 40 °C in 30 s by applying 2 V. The simple but effective procedure presented here is suitable to fabricate flexible conducting film and may also promote the development of portable and flexible electronic products.
关键词： flexible,polymer fiber,strain sensor,conductive,interfacial modification
更新于2025-09-23 15:22:29
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Modal transmission line theory of plane wave excited layered media with multiple conductive anisotropic sheets at the interfaces
摘要： A succinct and efficient transmission line formulation is presented for the analysis of plane wave excited planar multilayered uniaxial media comprising multiple conductive sheets at the interfaces. The conductive sheets may be anisotropic with a fully populated conductivity tensor, which results in the coupling the transverse-magnetic and transverse-electric waves. The transmission line formalism is thus extended to accommodate this hybrid mode of propagation. Three different algorithms for the solution of the transmission line network are developed and compared, including a numerically stable and efficient scattering matrix procedure. Numerical examples are included that validate the theoretical method.
关键词： Anisotropic conductive sheet,Terahertz,Transmission line network,Transition matrix,Graphene,Scattering matrix,Plane wave,Planar multilayer
更新于2025-09-23 15:22:29
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Marangoni interface self-assembly hybrid carbon nano-network for transparent conductive silicone rubber
摘要： Inspired by compact one-dimensional (1D) and two-dimensional (2D) hybrid network like natural thrombosis and beaver’s dam, we use Marangoni interface self-assembly hybrid 1D carbon nanotube and 2D graphene (CNT+G) as continuously connected nano-network onto the surface of silicone ink coated silicone rubber. Both good optical transmittance and electrical conductivity demonstrated in the transparent conductive silicone rubber (TCSR). Besides, the TCSR also have excellent mechanical adhesion between the (CNT+G) film and silicone ink coated silicone rubber.
关键词： Adhesion,Marangoni interface self-assembly,Graphene,CNT,Transparent conductive silicone rubber
更新于2025-09-23 15:22:29
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High performance and mechanism of the resistive switching device based on lead halide thin films
摘要： In this work, the lead halide was firstly applied in resistive random-access memory (RRAM) device with the structure of W/lead iodide/fluorine-doped tin oxide (FTO). The mechanism was investigated by reliable data fitting and the experiment of temperature influence, illustrating that the resistive switching phenomenon was origin from the filament. The iodide vacancies were considered as the main composition of the conductive filaments, which was verified by the first principle calculation and experimental verification. These performances were also found in device fabricated by other lead halide, such as PbBr2 and PbCl2. Moreover, they performed great potential as the non-volatile memory due to the excellent resistive switching properties. This work was of great significance for the expansion of RRAM material system.
关键词： conductive filaments,lead halide,resistive switching memory,first principle calculation
更新于2025-09-23 15:22:29
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[IEEE 2018 International Flexible Electronics Technology Conference (IFETC) - Ottawa, ON, Canada (2018.8.7-2018.8.9)] 2018 International Flexible Electronics Technology Conference (IFETC) - Optimizing the Electrical Conductivity of Screen Printed Silver Conductive Tracks by Post Treatment
摘要： Screen printed silver conductive tracks have been used or are being explored for applications in membrane switches, solar cells, radio frequency identification (RFID) antennas, diabetic testing strips, sensors etc. For many of these applications, optimizing the electric conductivity of the printed tracks is crucial. It has been noticed that the electric conductivity of the printed conductive tracks are highly dependent on the post-processing conditions. However, the understanding of the effect is limited. In this paper, preliminary study results show that ambient temperature drying followed by heat treatment offers the lowest resistance (highest conductance) for printed conductive tracks.
关键词： Electrical Conductivity,Printed Conductive Tracks,Post Thermal Treatment,Curing
更新于2025-09-23 15:22:29
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-shaped chiral metamaterials
摘要： A highly sensitive refractive index sensor based on the conjugated bilayer-shaped chiral metamaterial is proposed. It is composed of two-shaped structures and a microstrip connecting line. The strong conductive coupling between two-shaped structures can be realized by microstrip connecting line. The chiral metamaterial shows giant circular dichroism (CD) effect, and the CD effect can up to 93.8% and 96.2% at 1.767Thz and 3.008Thz, respectively. The physical origin of the observed CD effect is elucidated through distributions of magnetic and current at resonances. The designed conjugated bilayer-shaped chiral metamaterial as a refractive index sensor can achieve sensitivity of 1.065Thz/RIU and 1.777Thz/RIU, respectively. The effect of structural parameter on the sensitivity and CD spectra is investigated. Through this study we presented the giant CD metamaterial based on conductive coupling and its application potentials for low detection-limit physical and biochemical sensing applications.
关键词： chiral metamaterial,conductive coupling,circular dichroism,resonance,refractive index sensor,metamaterial
更新于2025-09-23 15:22:29
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Conductive TiO2 nanorods via surface coating by antimony doped tin dioxide
摘要： Titanium dioxide (TiO2) has been widely used as the white pigment in paintings and coatings. It is of significance to endow TiO2 powders with the high conductivity to extend its application. In this research, rutile TiO2 nanorods were prepared as the substrate material. Further the surface coating by antimony doped tin dioxide (SbeSnO2) shell layers was achieved to obtain conductive TiO2 nanorods. The morphology and structure of TiO2@SbeSnO2 nanorods was mainly focused on to obtain high conductivity by optimizing the calcination temperature. When the temperature was properly applied at nearly 500 °C, the calcination led to the fusion and attachment of SbeSnO2 crystalline regions on the surface of TiO2 nanorods, forming a continuous intact coating layer and thus getting lower volume electrical resistivity of the composite nanopowder. However, after calcination at 600 °C or higher temperature, the integrity of SbeSnO2 shell layers would be destroyed, resulting in the increased electrical resistivity. The conductive TiO2 nanorods obtained at the optimized reaction condition showed a very low resistivity of 52 ± 1.6 Ω cm, in contrast to 105 Ω cm of the pure TiO2. The conductive TiO2 nanorods would be excellent candidate for antistatic or electromagnetic shielding applications in coatings.
关键词： Core-shell,Calcination,Titanium dioxide,Conductive
更新于2025-09-23 15:22:29
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Transparent Conductive Materials (Materials, Synthesis, Characterization, Applications) || Metallic Oxides (ITO, ZnO, SnO <sub/>2</sub> , TiO <sub/>2</sub> )
摘要： The material class of transparent conductive oxides (TCOs) combines two seemingly contradictory physical properties: high optical transmittance in the visible and near-infrared (NIR) spectral range (like insulators) and high electrical conductivity (like metals). These two key properties make TCO materials very well suited for transparent thin film electrodes for thin film solar cells, flat panel displays, light-emitting devices, or heated windows.
关键词： ZnO,light-emitting devices,SnO2,Transparent Conductive Oxides,thin film electrodes,ITO,solar cells,TiO2,flat panel displays,TCOs
更新于2025-09-23 15:21:21